COMPOSITAE (composite FAMILY) 



803 



Annual ; Involucre 6-8 mm. high, of linear-subulate loosely 



imbricated bracts 



Leaves on brauchlets broader A. 

 i. Inflorescence loosely paniculate-corymbose. 



Bracts thin, uniform, linear-lanceolate; rays few, white or 



pinkish, rarely wanting 



Bracts firm, oblong, the tips foliaceous; rays numerous, 

 violet 



67. A. subuiatuH. 



h. 



. 54. A. acuminatua. 

 11. A. radtUa. 



Inflorescence definitely paniculate i. 

 i. Bracts ascending, their tips not squarrose. 



Bracts regularly imbricated in several series. 



Bracts linear-attenuate 



Bracts broad-linear or linear-oblong, with conspicuous 



elliptic or subrhombic green tips . , . .43. 



Bracts subequal 45 



i. Bracts with spreading or squarrose tips, the outer mostly 



foliaceous .... 46. ^. novi-belgii. 



C?. Stem conspicuously pubescent j. 

 j. Bracts with definite firm subulate tips. 



Involucre hemispherical or campanulate, as broad as high ; leaves 



lanceolate to oblong-lanceolate .... (33) A. ericoides, v. jjlaiyphyllut. 



42. A. paniculatut. 



A. nalicifoliua, 

 A. longifolivs. 



(84) A. depauperatus, v. parnicepa. 



55. A. tiemoralis. 

 54. A. aouminatua. 



Involucre turbinate, narrower than high . 

 Bracts without firm subulate tips. 

 Heads solitary or loosely paniculate-corymbose ; bracts thin, linear- 

 lanceolate, loosely imbricated ; rays" whitish, violet, or rose-pink. 

 Leaves essentially uniform and crowded on the stem, entire or 



slightly toothed, blunt or acutish 



Upper leaves largest, coarsely toothed, long-acuminate 

 Heads paniculate or racemose ; bracts rather closely imbricated. 

 Bracts regularly imbricated in several series ; rays short, white 

 to lavender. 

 Heads regularly paniculate; bracts linear-attenuate; leaves 



lanceolate (4'2) 



Heads in more or less 1-sided racemes ; bracts generally with 

 colored dilated midribs ; leaves lanceolate to oblong ". 

 Bracts subequal ; rays long, blue or violet ; stem densely villous 



(45) A. longifolius, v. xiUicaulift. 



40, 



paniculatus, vara. 

 A. laterijlorua. 



§ 1. HELEASTRUM (DC.) B. & H. Pappus simple, coarse and rigid, the 

 stronger bristles somewhat clavate ; bracts rigid, more or less foliaceous, 

 nearly equal. 



1. A. palud5sus Ait. Stems 3-7 dm. high, glabrous or nearly so ; heads 

 rather few, racemose or spicate ; involucre 1 cm. high ; outer bracts lax, foli- 

 aceous ; rays purple ; leaves linear, entire. — Kan. to Tex. , 

 niv.. „,. N. C, and Ga. Fig. 918. 



§ 2. BIOTIA (DC.) T. & G. Involucre ohovoid-hell- 

 shaped, turbinate, or cylindric; the bracts regularly 

 imbricated in several rows, appressed, nearly destitute 

 of herbaceous tips ; rays 6-18 ; achenes slender ; pap' 

 pus slightly rigid, simple; loiver leaves heart-shaped, 

 petioled, coarsely serrate; heads in open corymb* 

 {rarely congested). 



* Bays white {sometimes colored in age); 

 branches of inflorescence without glands. 



91 S. A. paludosus. 



*- Involucre ovoid-bell -shaped or turbinate; plants simple,, 

 rarely producing large tufted basal leaves. 



** Leaves thin, smooth or sparsely hairy but not rough. 



2. A. divaricatus L. Stem slender, somewhat zigzag, 8-9 

 dm. high, glabrous or sparingly pilose ; leaves coarsely and 

 unequally serrate with sharp spreading teeth, taper-pointed, 

 ovate, ovate-lanceolate, or deltoid-ovate, all but the up])er- 

 most heart-shaped at the base and on slender naked petioles ; 

 involucre 6-8 mm. high ; bracts thin, scarlous, mostly obtuse 

 and ciliate, with inconspicuous green tips, the outer short and 

 oblong or oblong-triangular, the inner linear ; rays 6-12. 



919. A. divaricatua. 



